24
E46 Climate Control
DIAGNOSIS
Troubleshooting of the solar sensor (left/right) is carried out through the IHKA diagnostic
program using the DIS or MoDiC.
Status displays for the solar sensor input are available in percentages. The status displays
can be checked while applying a light or heat source to the solar sensor to view the change
in value.
The E46 diagnostic program for the IHKA
system contains a test module B6450-
00011 for testing the operation of the solar
sensor.
The IHKA control module monitors the solar sensor and will set a fault code for:
• Shorts to B+ or ground
• Open circuits
The IHKA control module will function as a system without solar influence correction if the
sensor is defective.
Recognition of the solar sensor and its influencing capabilities is enabled via ZCS coding.
Remember to adopt the code whenever possible to avoid loosing car/key memory function
changes. Also the IHKA control module must be disconnected from B+ before coding can
become permanent.
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